ex·trav·a·sate 
(ĭk-străvə-sāt′)
(ĭk-străvə-sāt′)v. ex·trav·a·sat·ed, ex·trav·a·sat·ing, ex·trav·a·sates
v.tr.
1. Medicine To force the flow of (blood or lymph) from a vessel out into surrounding tissue.
2. Geology To cause (molten lava) to pour forth from a volcanic vent.
v.intr.
1. Medicine To exude from a vessel into surrounding tissue.
2. Geology To erupt.
[EXTRA- + VAS(O)- + -ATE1.]
ex·trav′a·sation n.